delhead: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/delhead - from package: wcstools

You may install the required package with command apt-get install {package}

Error in other languages:
delhead: bevel nie gevind nie
delhead: comandă negăsită
delhead: comando não encontrado
delhead: commande introuvable
delhead: command not found
delhead: käsku ei ole
delhead: không tìm thấy lệnh
delhead: komanda nerasta
delhead: Kommando nicht gefunden.
delhead: kommandot finns inte
delhead: komut yok
delhead: nie znaleziono polecenia
delhead: níor aimsíodh an t-ordú
delhead: no se encontró la orden
delhead: no s'ha trobat l'ordre
delhead: opdracht niet gevonden
delhead: parancs nem található
delhead: perintah tidak ditemukan
delhead: príkaz nenájdený
delhead: příkaz nenalezen
delhead: команда не найдена
delhead: командата не е открита
delhead: 命令找不到
delhead: コマンドが見つかりません